We are an experimental research group in the Department of Physics and Astronomy, Seoul National University. Our group studies ultracold gases to investigate collective quantum phenomena such as Bose-Einstein condensation and superfluidity. Quantum gases are highly controllable and clean systems, presenting a new experimental avenue for fundamental study of quantum many-body physics. Our goal is to exploit and develop various quantum gas systems to search for new states of matter and to address challenging problems in condensed matter physics.